Sedhumadhavan Parthasarathy1:
> Hi All,
> 
> Our primary outbound mail is configured in postfix MTA. We would like to 
> set a secondary outbound mail server on DR sitee.

With all Postfix versions, you would set relayhost to a name that
resolves to multiple IP addresses (in DNS or /etc/hosts). In my
first 10+ years in IBM I had:

    relayhost = $mydomain

i.e. use the MX records for the local domain.

Later I had to change that to

    relayhost = [na.relay.ibm.com]

i.e. use the A records for a regional mail cluster.

> Will it possible to configure secondary outbound mail server on Postfix ? 
> Postfix will have high availability functionality ? 

Having multiple servers helps.

With Postfix 3.0.0 you could use this:

    sender_dependent_relayhost_maps = randmap:{[host1], [host2]}

You could even list host1 and host2 different numbers of times
to get a load split different from 50/50.

        Wietse
> 
> Cheers...
> 
> 
> 
> Sedhumadhavan (Sedhu) Parthasarathy
>  
> 
> Infrastructure Architect
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